a(n) = 6*a(n-1) - 7*a(n-2) - 2*a(n-3) for n >= 3, with a(0) = a(1) = 0, a(2) = 1.

A345031

a(n) = 6*a(n-1) - 7*a(n-2) - 2*a(n-3) for n >= 3, with a(0) = a(1) = 0, a(2) = 1.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =6a(4) =29a(5) =130a(6) =565a(7) =2422a(8) =10317a(9) =43818a(10) =185845a(11) =787710a(12) =3337709a(13) =14140594a(14) =59904181a(15) =253765510a(16) =1074982605a(17) =4553728698a(18) =19289962933a(19) =81713711502a(20) =346145071085

External references